Commit 74f0d4ab authored by Sebastian Holtermann's avatar Sebastian Holtermann Committed by Brad King
Browse files

cmCryptoHash: New byte hash to string function

parent 94c29976
......@@ -34,6 +34,37 @@ CM_AUTO_PTR<cmCryptoHash> cmCryptoHash::New(const char* algo)
}
}
bool cmCryptoHash::IntFromHexDigit(char input, char& output)
{
if (input >= '0' && input <= '9') {
output = char(input - '0');
return true;
} else if (input >= 'a' && input <= 'f') {
output = char(input - 'a' + 0xA);
return true;
} else if (input >= 'A' && input <= 'F') {
output = char(input - 'A' + 0xA);
return true;
}
return false;
}
std::string cmCryptoHash::ByteHashToString(
const std::vector<unsigned char>& hash)
{
// Map from 4-bit index to hexadecimal representation.
static char const hex[16] = { '0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
std::string res;
for (std::vector<unsigned char>::const_iterator vit = hash.begin();
vit != hash.end(); ++vit) {
res.push_back(hex[(*vit) >> 4]);
res.push_back(hex[(*vit) & 0xF]);
}
return res;
}
std::string cmCryptoHash::HashString(const std::string& input)
{
this->Initialize();
......
......@@ -29,6 +29,13 @@ public:
/// @return A valid auto pointer if algo is supported or
/// an invalid/NULL pointer otherwise
static CM_AUTO_PTR<cmCryptoHash> New(const char* algo);
/// @brief Converts a hex character to its binary value (4 bits)
/// @arg input Hex character [0-9a-fA-F].
/// @arg output Binary value of the input character (4 bits)
/// @return True if input was a valid hex character
static bool IntFromHexDigit(char input, char& output);
/// @brief Converts a byte hash to a sequence of hex character pairs
static std::string ByteHashToString(const std::vector<unsigned char>& hash);
/// @brief Calculates a hash string from string input data
/// @return Sequence of hex characters pairs for each byte of the binary hash
std::string HashString(const std::string& input);
......
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